Fuel filter



July 9, 1935- J. E. MALIVRT FUEL FILTER Filed Aug. 9, 1933 .2 "Sheets-Shoot 2 Patented July 9, 1935 yFUEL miran f i Jules Eugne Malivert, Levallois-Perret, France Application August 9, 1933, serial No. 684,448

In France September 27, 1932 6 Claims. (Cl. 21o-165) l Y the flow of liquid. Orifice 5 may even be made of The present invention relates to fuel filters, and more particularlmto those of the type generally employed on automobile and aeronautical motors.

The gasoline filters ordinarily mounted on auto- 5 biles are placedl adjacent the motor. In practice, it has been found that the heat from the motor frequently converts the gasoline inside the filter into a gas and accumulation of the latter diminishes the fiow of fuel through the wire cloth or l similar filtering element forming part of the filter assembly. In extreme cases the flow of gasoline through the filter maybe completely interkrupted. .i

One of the objects of the invention is to provide an improved form of filter assembly wherein any gases accumulating therein are vented into the discharge conduit supplying fuel tothe motor carburetor.

Other objects will appear in the course of the detailed description now to be given with reference to the accompanying drawings, in which:

Fig. 1 represents an axial section through one illustrative embodiment of the invention;

Figs. 2 and 3 are similar sections taken 'through two other possible forms of the invention;

Figs. 4 to 8 inclusive show, in section, five dif- ,ferent variants of the gas 4venting element illustrated in Fig. 3;

Fig. 9 represents, in axial section, still another form of the invention;

Fig. l0 shows, in section, a special form of flange adapted to be used in assemblies of the type represented in Fig. 9;

Fig. 11 is an axial section taken through a variant of the assembly shown in Fig. 9;

Fig. 12 is an enlarged detail of the venting plates in Fig. 11.

Referring to Fig. 1 of the drawings, there is shown an assembly composed of a detachable glass globe I of conventional design limiting a filtering chamber, a spherically shaped filter 2 formed of wire gauze in the usual way, afuel supply conduit 3, a fuel discharge conduit 4, a cylindrical cap 'I inserted into the top of filter 2 and having a vent hole formed therein, a tube Ii supported in conduit 4 and having an inlet orifice 6 formed in the upper end thereof, tube 6 extending into element 1, a plate a supporting filter 2, and a spring tending to force element 1 into contact with globe I.

Venting orifice 5 should be positioned at a point where there is no danger of unfiltered liquid passing inside element 1. If desired, this orifice may be made of capillary dimensions so as to permit passage of gases while opposing a resistance to very considerable section and inserted therein.

a wire filter may be The manner in which the above described assembly operates is practically self evident. Va-

pours orv gases accumulating in the top of globe I will evacuate through orifices 5 and 6 and will flow to the carburetor togetherwith the filtered fuel traversing filter 2. structures are designed The auxiliary venting so that ordinary filters may be easily transformed into structures of the type shown in Fig. 1.

In the form of assembly represented in Fig. 2, gasoline or similar fuel enters via conduit 3 and is deflected downward byy a frusto-conical flange 91. so that gross impurities fail into an annulargroove Il and may be evacuated by unscrewing a plug I0. The fuel will then rise into the upper part of globe `I and pass through filter gauze 2. If vapours or gases accumulate in the top of globe I they will evacuate through capillary orifice 5 formed in one end of atube 9 communicating with discharge conduit 4. The fuel filtered through gauze 2 will finally pass through orifices 8 formed in a plate 8 to join whatever gases may flow out through tube 9. 'Ilie assembly is completed by a spring b1 the top of gauze 2 and globe tions also to prevent vortices from forming inside the filter interposed between I. Flange 9l funcassembly.

Fig. 3 shows the invention applied to an inverted form of filter. Here, fuel enters, as before,

through conduit 3 to filter gauze 2 and flows out region above wire gauze 2.

ll globe I, then traverses through conduit 4.

taking place, a hollow venting tube or nipple II of conical form is inserted in the lter gauze and is provided with a capillary orifice 5 similar to those described. Nipple II should be positioned so as to extend slightly into conduit 4. The filtered fuel entering the discharge conduit and flowing past the outside of the nipple will then act in the manner of an ejector to aspirate any vapours. If orifice 5 is not of capillary dimensions 4 but has a considerable section, it should be provided with a wire gauze (not shown) In the variant shown in Fig. 4, the lateral walls of conduit 4 are given a conical instead of cylindrical form to modify the velocity of the liquid current flowing outside of nipple II.

The variant shown in Fig.

5 differs from the one represented in Fig. 4 only in that nipple II as well as the lateral walls-of drical.

conduit 4 are cylinlll In the variant represented in Fig. 5, nipple il is of cylindrical form and is provided with a plurality of capillary orifices 5 positioned in staggered relation to one another.

In Fig. '7, element I I is made concave and supports a ball valve l! tending to float upward into a conical seat 5: passage for vapours taking place through a plurality of .orifices 5.

Fig. 8` shows another variant wherein capillary orifices 5 are positioned at the lower, instead of at the upper, end of element Il.

In Fig. 9 another form of inverted filtering assembly is shown wherein venting of vapours and gases is effected via capillary orifices 5 formed in a fiange 21 supporting filter gauze 2, said flange being clamped in position under globe I.

If desired, annular flange 21 may be given a buckled form as shown in Fig. 10, orifices i being formed at the top of the annular groove.

Figs.l ll and 12 show a variant of the filter illustrated in Fig. 9 wherein a plurality of superposed plates i3 provided with extending points |31 are'inserted in the upper part of the assembly on the discharge side of wire gauze 2. Gases accumulating inside globe i and outside of gauze 2 are free to make their way into conduit 4 by passing into the spaces between adjacent plates I3. The height of extensions |31 may be chosen so that gases are free to pass between adjacent plates while liquid is prevented from so doing by capillary action.

What I claim is:-

l. A filter element for use in a fuel filter including a casing and fuel supply and discharge conduits both opening into said casing, which comprises, in combination, a filtering partition adapted to be removably fixed in said casing between said respective conduits and operative to prevent the fiow of impurities from one into the other, and gas venting means carried by said partition provided with at least one hole forming a communication between the opposite faces of said partition and arranged to be positioned in the upper part of said casing when said partition is secured in position therein.

2. A filter element for use in a fuel filter including a casing and fuel supply and discharge conduits both opening into said casing, which comprises, in combination, a filtering partition adapted to be removably fixed in said casing between said respective eonduits and operative to prevent the flow of impurities from one into the other, said partition including a central filtering part and a solid annular flange rigid with said central part, said annular flange being provided with a venting orifice for establishing a communication between the opposite faces of said partition.

3. A filter element for use in a fuel filter including a casing and fuel supply and discharge conduits both opening into said casing, which comprises, in combination. a filtering partition adapted to be removably fixed in said casing between said respective conduits and operative to prevent the flow of impurities from one into the other, a hollow venting member carried by said filtering partition, and provided with at least one hole in its upper part, said member being so arranged as to be positioned in the upper part of said casing when said partition is secured in position therein.

4. A filter element for use in a fuel filter including a casing and fuel supply and discharge conduits both opening into said casing at the upper part thereof, which comprises, in combination, a filtering partition adapted to be removably fixed in said casing between said respective conduits and operative to prevent the fiow of impurities from one into the other, and a hollow venting member carried by said filtering partition extending upwardly into said fuel discharge conduit, said venting member having at least one orifice formed therein.

5. A filter element for use in a fuel filter including a casing and fuel supply and discharge conduits both opening into said casing at the upper part thereof, which comprises, in combination, a filtering partition adapted to be removably fixed in said casing between said respective conduits and operative to prevent the flow of impurities from one to the other, and a hollow venting member carried by said partition and having its upper end extending into said discharge conduit, said member having at, least one orifice formed therein at the upper end thereof.

6. A filter element for use in a fuel filter including a casing and fuel supply and'discharge conduits bothA opening into said casing, which comprises, in combination. a filtering partition adapted to be removably fixed between said respective conduits and operative to prevent the flow of impurities from one conduit into the other, and a plurality of spaced plates carried by said filtering partition and interposed between it and said casing so as to form a plurality of venting passages establishing communication between the opposite faces of said partition.

JULES EUGNE MALIVERT. 

